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The common placements of measurement calipers when measuring the optic nerve sheath diameter (ONSD) are internal of the dura mater (ONSDint) or external of the dura mater (ONSDext). In this image is also shown measurement of the optic nerve diameter (OND). Measurements are performed at a depth of 3 mm behind the retina. Image originally published by Pansell et al.11. Reproduced under the Creative Commons License (CC BY-NC 4.0).
